Hi, I'm running 3cx free v6.0.570.0. I have a PSTN line setup using a SPA-3000 with the latest firmware (3.1.20(GW)). Its working flawlessly, apart from the caller ID. I have read the configuration guide for the SPA-3000, but if I set the User ID to anything other than the virtual extension number(10001), it can't authenticate. Error: Reason: Credentials don't match, check that authorization-ID and password match the ones in extension settings. If I have PSTN CID for VOIP CID set to 'no' in PSTN config it works perfectly. But when it is 'yes' the line registers fine, but as soon as someone calls I get this error: Authentication failed for SipReq: INVITE <email@example.com tid=-6127aeec cseq=INVITE firstname.lastname@example.org:5060 / 102 from(wire). xxxx is my cell phone number. Hope you can help! Thanks in advance.